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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e82216e33af0790562d4a9fd88d62a11e7b2caf58dc0690cf23c423d2b2830b1' 
  AND token = 'Pg6QTsfWlm+eOTLtpppGxpjFppdgvDeDroJLEh+iRXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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