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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e072cd69f81267ce5178ea4875afd06e9a47875fbe227c030ea93be8b703a74f' 
  AND token = 'bxtyjmrfeHm4CXvvjiie9XR5NGbXKQpPNmiq/X2NLfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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