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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0acd976f6b5d224823188ffad465831c79d5def366cf921d45e882eabd880c01' 
  AND token = '7jtk5NrqmTz4Ox95l2l/u5kZ3xJP4ldEW53OS1sVTN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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