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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5f599ab1a34242cef2a0eec1221ca47199373ed427e93ffe5315e969fbd3280' 
  AND token = 'Hczzi7r1adHO7MC0tymCLnrkPMLDMnBVbanQIYX8L6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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