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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1f02676abb8d3edbc51127de3b71114b6cfe9b7126245ca0a7f8a7a3dd8f5e1' 
  AND token = 'rkha3a34hpKFrGkWTKufW0g9L/wnYdZsVAIJAb05ZsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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