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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd96707d87ef36e3cf278b175146f6cbdf5050ca4430ae2a2c99268096768d079' 
  AND token = 'wDknh29RtpfVUwrLdW68MKMem5os7UanlwVPfuWYSBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}