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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '384b5abcedf9ce7c73db5b3b42d80917d862608af9e6c2459079145428fa7937' 
  AND token = 'Fhx4X3KpA2KkOedCMKz/yk0a87uCI0qjl5+4jh2gpsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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