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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a412339443cf35213d03d7d6b0eea64012e11034994e3c5cf85ad8cb04db8d0' 
  AND token = 'T5gFNbeAkgzfUDZcLq3LOXkEAmdo2ntZcKyXZ/UB038=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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