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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '061d080b10e62ba2e68c259d294fab2fc46d660fdb22533cebe764f288c880e6' 
  AND token = '9tJBQhLw1AHQfnhO6DcnfzJ4unF0qxPNqympszy9N4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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