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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee6d0178deb0e0d62afa8bb7163ca9999dd095b4945a8ae2cdb00f9ab6e27dba' 
  AND token = 'EpgJVqmc8mBQOncO3ft+4HqzJwsJvXaiv9Z66nFM0hI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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