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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fc93c0c9bd7c61e0d988b22709b816bc34c44efd60798d7035660870bc0b4c7' 
  AND token = 'RCrtnsbUmsQUFlsuYa50z1UnfpP+xijBRKycKVE7N2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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