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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bee3d843b35513acf61283de4a0b34840a59a83176d0221c26cef85d95461bb' 
  AND token = 'pG0DJtr+vMaGdvOEOW726/baoB+lPdVGRds0MCrF2S0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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