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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4efcd03fe5b2101eed1112faf5da1e950ca19b2b0a58dd2e6dcab00f86f63be' 
  AND token = 'twZbGiPjXTGo18z2YUeNmw9BROqIc5IRiQaOPlCJ2uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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