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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf784aa9c45a8482c35ec5218065a02441749c2a62e1696a8f368cc81941aa3c' 
  AND token = 'kM8KnvcVnAYXoQTHOOGNtE49VdGbCFHFD8rJARjpQlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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