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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c7a1b7c1032892ee4f5321aabe578ae95e5c0e17cf545bdfae134f5a45f403f' 
  AND token = 'Koo6IwpCKvPcJDU9N1V6JuJ7YFDuEVfA6Hmpa0G8ngM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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