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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0053138aa2427a2e2ff0411b2c2efaded5ac91c1c68e61c09f893dae925bf4d6' 
  AND token = 'f4NH4LwUYW4tmjnM8+Dt4BuilQvXr0JJm4mkohfvb44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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