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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99ec2710819a6a72f714827f79b2e669342f2f4d779af8dba30992f564d87147' 
  AND token = 'SYHx41P0NtWG3JFfUZbtZMl+DahET3A/tBy2XcdEVyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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