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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a3162ac9b4252f1664129ba8ea99df6762a71c14746689ca41eda5a8f12a73d' 
  AND token = 'Az2Jip04+0hrWfaNNAWS8GmXtUM42+R3IPrs0f+g8ag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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