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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fc62d01704e3b2ba0e4cd858abb0cf0e2380a3c431bbb713c11be1bc490f719' 
  AND token = 'bTNVMtzAY7xICjGBNBi4i5HAAZ7DNTTr+pJq80WHvfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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