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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7670ccd2bddf9b53c976c90d87b3cbf033e6bf89b3e549d86d705e730456b2ec' 
  AND token = 'jDb74/lDvCjHm4WvlUWuVAtFCaPH8FF3a2MT/lMe9Hs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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