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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '448a11315ba7b220b86a1f65c58efe5f71a903b7612709a64003a7507a54ad15' 
  AND token = 'iNR/MpwbYdjo0NJFx6FlJ19usgGuPqLIX3TfUlTGxX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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