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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de00cafe15d228c8c948180c7e6502a3e4ccacb5964d7fff3cd522719356ede6' 
  AND token = 'UuX3b1TLYAq1MdThP0k6Wu0zZR00b7PlIzELX8LiDHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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