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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c87fbc007188c33fe09a1ac3dbf5136e18828e075e9596f42b4588c3a09e7b7c' 
  AND token = 'sMx83Arca9Mx31Npf2wvCKrwZpoR2M75rys9ebJDRnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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