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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a3fa36df5a019f9c68d1bd1097b9d6cd8e149537e401ccddf01d38105d8e970' 
  AND token = 'BXdKlwAkcorB4vbASDfZQ3i6ASBfi78UpHLLz2fZOtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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