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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b527a892fb3aee9a5a51e4b48f01c541baf3fedaba9d8b253d061a86cac94a7e' 
  AND token = '3sYE6hcSjhWv1XzLZ4gMDPFTfma/fxoZaLGzP35koiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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