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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea8255298f0cd6ce7393113850007d048dbe9c9ab96202d96771d106d3261c75' 
  AND token = '6nDEqDmluHC1eKre4Lv/Q1jfMW6EtSK98bHQ+texMmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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