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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64e5a842ccf0424f587c07641457d5c1a4c582e2c18e4ff8893dd9966ac595b9' 
  AND token = '9QIsnqokG626bCQtZjnFkhXspZ55qW08FDl9FSkS38g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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