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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ea3c968ddae3313ad264705ca1b73dc040fa8a545174c9c3b5ccbcfa60f12ec' 
  AND token = 'jMEr9tMw2UI+on7rddLyrccf9v/4I/d53XALove5GHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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