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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f57e900d84396bfa9383d0fe10a819dab8360c2922d79a38a194bc665a04cfd8' 
  AND token = 'BaamPYK8aF6XqDC7Kglmgd5s0Z2STYJB6hS2vkPzEPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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