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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd172817881ab0f6e448bef7caba9f2775b4424d107b80b84f735625071c1c724' 
  AND token = 'vZFt8qAQPjUf+QnmvhW63NdKrwkxY5P3NlmTUEkIog4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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