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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd40bcc9359916d3cc2f9b0dacd9b3019b9579e9710b24ce5414793eed92c22f' 
  AND token = '0kVHnCNMMXzNRdelg36sBcPPMj+3G+Suw7vQnzYzpvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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