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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9985567436731e914c0c25d2279f321b2b0f6c88cefc662f5f8ef644fa25f9a9' 
  AND token = 'hsdksMutdcYEp/w1y2IjFgygKEyqeSpezP7Wbz6tknY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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