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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9983416a53d3ee9483320e845a9ad632dc1a17fb61ef52529664065061b25c49' 
  AND token = '7HNKUetMxkMK++kMnLLVxmIi/Eh7piMeprsy7F/wvPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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