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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '832b63d7b78e6a6ece6b42867f149eafc3f8119bc984584ab0fd0fc0a6bf351d' 
  AND token = 'FGSdN4cwzOL5Mk7mx0ncdSeoZvyGXpd+5wJmX07UT5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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