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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '352c57bb09b7da79092d5b0f0d03cd4be0b504599a4e893a1e9f36b5b19626d9' 
  AND token = 'www+1pDuVyaOcrjys5arCi9wILJIocE4PKJDKA2+lO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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