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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93405f90b6ec2bfe9e1d898e7547ed02280af0d16dd87a5235ecad40ca079d97' 
  AND token = 'FMPmyNQjApa/9CPNX68ghASY/khQOPAQBV6xiwjDGGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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