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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26a5cf5d67ef3063a9ca0fa8f95ee868ddadd36f8dada4cd2b8c66d8ff9f2c62' 
  AND token = 'FLvU9oQqJ2XikOsV3+rzyrUB71mRM3DPK9rPxU0FMI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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