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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1af0c4351b9269bfb2003350a1b08dfba447eaa17c7dd4556227f692bc00cf10' 
  AND token = 'VJ60tb8lo+Xs4+4jNW+JVqWSqZG/38C+6ZT46O+7Z2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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