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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ba28bd06d795310fe5defcae73f09a696ed48a9504103356874df1d00c3de7e' 
  AND token = 'kPjRaoFcOZZ7deaQphWqhma1zI8REv5AqX+Rf6e1JSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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