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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '900d84ec12474c405fe4b0b09863bf97614659a44dec2049d4c87cf7b324bbe1' 
  AND token = 'Y+75AFad4J5ZiNC0Y9qlOQ1El/+GoEdRfPPG3ixe2W4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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