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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '247487cdd97df6dbbb5d0079d277b61c9edbbb2e6603ab784a75d45996ea28f8' 
  AND token = 'D3egKphXKA52sJWU3dfQF7YX36CFgxlrRczSdHPjjKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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