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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e01d9399ab2cef8a632afc785fe352d94ddfe42c68d1072909876f8726c525f0' 
  AND token = '51cc5nfdEp83WeIZPCF/hI9ELgf2ot6FVeBw+WiRNAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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