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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe3040d945f50ac56a98bdf6730b245894a9edd74b435cb6d938e2a2f2b15cef' 
  AND token = 'Qu9xFdbMnLzbNuLecFYju9ODY6WSNyLu9Hn4f2PsnY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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