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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70f3bab4378b41ef2957fa86b157f0fc8925b8ad20c3d0476fddc888418c0df4' 
  AND token = 'I/Dznb3NFH5h6774RzF31k5fBE1ryDGYn5pboWjIMDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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