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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9fc291b4ee7de32687d382957996a4de9831504df1269cbbae1612bc0cba0d4' 
  AND token = 'SYDL+YJ1saxiC21DZil8qF2OoIUWeNjHwUzWP1d/GcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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