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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57f4bc74156613e7d123e7d560411f47836d5abab6bc2c02850ddfa8509c6c97' 
  AND token = 'swfVA0ovdAlQmppEXz5aP/plQyzR/6R06wfiZsct/Hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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