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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e39b99672516c797a75da923e674d6beae0b43077d6efc5a6d75eb4b56ead11' 
  AND token = '7aNqKTmppIEI3Ih/gqq4Igy+qjZ3AS7npGTCGScVhYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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