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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d44743aeeda950017bebe5ca5ffa87ffee7b1f66d36416339144597c81ae2fe' 
  AND token = '8/v/lQ0+YQheMfPalscpGjQLtzrD9U4OPiyAN/mvqRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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