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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15684b6d26271e4240b2656b3340c72f479086eefddb4095ffa495f42bd64eb6' 
  AND token = 'k7QZvxoTpc25vIQU6TQLv+xmL2PMi5i0/gnFXr8olrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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