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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '880eb811d2c10fb7c3e1d842ca613c2248d6781e3603fe8178bb28c7b8688530' 
  AND token = '3/dkWNTzu6HqbLXI887esOeJ+Q0tYEX21VNR7LnIxAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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